Today, after days of trying all manner of things to eliminate clicking noises from my new Sugino XD crankset I believe I’ve got things in order. See the trouble is there all sorts of conflicting information about how to properly remove and install Shimano square taper bottom brackets and cranksets.
Some of the key points of contention are:
- Grease or no grease on the tapered spindles
- Grease or loctite on crank bolts
- How much to tighten crank bolts
- Grease or loctite on bottom bracket threads
In general if you grease the threads of a bolt, you will be able to torque it more than if it were dry. Some folks take this to mean using grease increases the risk of over tightened parts. Perhaps this is why the Campagnolo specs for their square taper bottom brackets says NO to use grease on the spindles.
Also, loctite seems like a smart idea, but it really depends on how often you need to remove the bolts. It also can leave some gunky stuff that you have to clean out before tightening back up. After a point it’s almost like having old glue residue clogging up threads.
Here’s how I installed a Shimano UN-54 bottom bracket and Sugino XD crankset on my Kona Dew Deluxe.
- Clean all parts. This includes the threads on the inside of the BB shell on the frame.
- Grease the BB shell threads.
- Thread the plastic non-drive side BB cup. I got mine to about 25lb.ft. Spec says more is ok, but I’ve broke stuff acting like a gorilla before.
- Grease the smooth plastic of the cup where it’ll come in contact with the BB cartridge
- Thread the cartridge. Take note to include any spacers as necessary. I’d neglected this and believe it contributed to a “clicking” noise when the drive side crank was at 1:00. If you do include a spacer(s), be sure to grease all sides of it. I tightened this to about 25lb.ft as well.
- Attach crank arms to BB spindles.
- Grease crank bolt threads and the inside of the bolt heads.
- Tighten the crank bolts to spec, or be a wuss like me and stop around 30lb.ft.
Most professional bicycle mechanics I talk to don’t ever specify torque settings – instead they tell me “I tighten by feeling”. That must be why their labor rates are so high.Â